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Drain tuna and add it to a medium sized bowl.
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Once the apple, celery, onion, and olives have been diced, add them to the tuna.
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Mash the avocado in a small bowl. Using a spatula, add it to the tuna mix.
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Sprinkle the tuna mix with parsley, garlic powder, salt, and pepper to taste, and mix well.
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Using a potato peeler, remove the skin from the cucumber and chop off the ends.
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Cut the cucumber into thirds and the slice each third in half lengthwise down the middle.
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Using whatever utensil works best (I used a knife but some people prefer spoons), remove the seeds from the center of the cucumbers.
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Stuff the cucumber boats with tuna salad.
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Garnish with more fresh parsley if desired.